EIFS

EIFS (Exterior Insulation Finishing System) foam makes your job easier, it can be cut and designed to meet your individual needs and the needs of your jobsite. The lightweight properties of foam versus wood or metal makes hanging and finishing your project easier and neater.


Exterior insulation and finishing system (EIFS) is a general class of non-load bearing building cladding systems that provides exterior walls with an insulated, water-resistant, finished surface in an integrated composite material system. EIFS was developed in Europe after World War II and was initially used to retrofit masonry walls. EIFS started to be used in North America in the 1960s, and became very popular in the mid- 1970s due to the oil embargo and the resultant surge in interest in high energy efficiency wall systems such as EIFS provides. The use of EIFS over stud-and-sheathing framing instead of over solid walls is a technique used primarily in North America. EIFS is now used all over North America, and also in many other areas around the world, especially in Europe and the Pacific Rim.


EIFS installation


   EIFS is typically attached to the outside face of exterior walls with an adhesive (cementitious or acrylic based) or mechanical fasteners. Adhesives are commonly used to attach EIFS to gypsum board, cement board, or concrete substrates. EIFS is attached with mechanical fasteners (specially designed for this application) when installed over housewraps (sheet-good weather barriers) such as are commonly used over wood sheathings. The supporting wall surface should be continuous (not "open framing") and flat.


Composition and types of EIFS


Types of External Wall Insulation Systems (EWIS)


Types of EIFS are defined by their materials and the existence/absence of a drainage plane. The EIFS Industry Manufacturers Association (EIMA) defines two classes of EIFS. 

 Class PB (polymer based) identified as PB EIFS and Class PM (polymer modified) identified as PM EIFS.


PB EIFS is the most common type in North America and historically used expanded polystyrene (EPS) insulation adhered to the substrate with fiberglass mesh embedded in a nominal 1/16 inch (1.6 mm) base coat which can receive additional layers of mesh and base coat for stronger impact resistance. Other types of insulation board caninclude polyisocyanurate.


PM EIFS use extruded polystyrene insulation (XEPS), and a thick, cementitious base coat applied over mechanically attached glass fiber reinforcing mesh. The system has joints similar to traditional stucco. PM EIFS have evolved to include different insulation materials and base coats.
The most common type of EIFS used today is the system that includes a drainage cavity, which allows any and all moisture to exit the wall.

EIFS with drainage typically consists of the following components:


An optional water-resistive barrier (WRB) that covers the substrate
A drainage plane between the WRB and the insulation board that is most commonly achieved with vertical ribbons of adhesive applied over the WRB Insulation board typically made of expanded polystyrene (EPS) which is secured with an adhesive or mechanically to the substrate
Glass-fiber reinforcing mesh embedded in the base coat 
A water-resistant base coat that is applied on top of the insulation to serve as a weather barrier.
 A finish coat that typically uses colorfast and crack-resistant acrylic co-polymer technology.